alphabet soup

(countable, uncountable) A type of soup that contains noodles in the shape of various alphabetical letters, sometimes also numbers.
(countable, figuratively, uncountable) A cryptic overabundance of acronyms and abbreviations.
(countable, figuratively, metonymically, uncountable) A quantity of people or organizations that are referred to by acronyms.
(countable, figuratively, particle, uncountable) A physical state in which there is a miscellany of different particles, often designated by letters.
(countable, slang, uncountable) The series of preliminary races (denoted by letters) through which drivers must advance to the main event.